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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66008d02766ac8b232dc65c6f00e3b1c81d33c2c06cd51178a65db25f1cfc585' 
  AND token = '1sDvz4fNiVoNwKoQYB0k8NnDggopJnGeb5jVut8jFXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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