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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832b420fbfcc282f14262654c1dcf1ffcd39b876c5ea606025e11d984a00aded' 
  AND token = 'mr5DqU0q4/x9EC/5BfHOJqRFEg3dSYNVHpyLYKcrPhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}