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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aac8b6f1716fee18ef3e734ace09e6c247ca4bca92b5d6b86c2e45ff585f635e' 
  AND token = '/6ad6JtSjVDnMLoTTMf55tqdvjGun1bwuRlNWJWpqgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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