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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b7a0af5fd488b63b7b63c2270a584443f5289eaae4d63085d456c43d8efe3d8' 
  AND token = 's6QdFZHpMVHkv7vdePf5Hqn8/+6OuGZjC4QBhyzbD74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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