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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '770a8aed32a8a707bc32d287efb043e18fc4a1eea0b8a5a97eb47eb0ed3b1269' 
  AND token = 'OU1vxT/P2OBAnrfIetFnonAfHwMSaXYfFnhAldsFb44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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