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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3669045daa2ab9b0280882f2db03ec50f71ded0409aaa92635c42868f6b9e2be' 
  AND token = 'ZvMd9uhJ3oekuElCXrGn4/3Knc6M/K9MQaD4zg9fwT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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