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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c62ac2af595a279a814a3d5700ef843ecb22ef5c8b8d39fa124bed47a77f03a' 
  AND token = 'leDq62E1E3UtoeEw0s8VK522MtIFJLiq7T5BqTlboUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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