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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06d164d8f140e13af57305f7303de1c9efe26d761cdf7f618e1c3dc7153e0875' 
  AND token = '1RYfLLtASWWQY2o1IfAoZsy0Yg71rnZmniHJN5gYcjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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