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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8036d8f01f1b89a5df9c9a3f5da1a029533f8ce3292575fc770cc2b13c9dda39' 
  AND token = 'i7ML5O8Z30sJghVMBx7rdqnjyI+TQRZT5azOdMCOivA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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