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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bf9f9a997231f9093b8908ae522cd611d9f4b7df93ffc2263ad68eb3758335c' 
  AND token = '+AgFu86ZP81PMYHXX9Gcx4emoQDpdOg6mrLy9cqMM34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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