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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a546ba8591c76e3e3af4d6493b20b3db01461d50c55f2b2662f15ff5e17c8d3e' 
  AND token = 'bxCWcyhe1ACvGqQpCOW9456mruab3IKx+3N9Vdm79A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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