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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e2e625dcb61a569b0432cb3f91a4045d26b48fde66f137b8f852aee3b06b08' 
  AND token = 'LjfiTWvxLnO2lU0kHIsCcI8HTiD7xOCiTX8EuqD+8mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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