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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '364cc03a90dac57d8d481316dc35c9d1bdd62d1ac90a979431a46b1675014c51' 
  AND token = 'wfLxKoU3wSLb5ze+9PC6+txqDde1FQeMzUErWQP6MUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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