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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a1a871c4f0f977970d07caa76720736a4f3088bd2a74d17cb8d04169b7c194a' 
  AND token = 'xBE9spkNlKE5LdbWSrUylaiis2Eza5X0GBfrdFYqeL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00210

JSON explain

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