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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f66563a79bfd9672f846d7c7ebb5af223e420f16c57a4d3356ea18caa8c77d' 
  AND token = 'n2EV9qrLhoo/6/J1UX2V2SQjmxExZFoN0zY3rEOzLU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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