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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68a601106ea7f0b796a0bc6083c63f408b5f4d7b58c52a71212778956e7fa36' 
  AND token = '9dPMIuuTNTqN9kJUDnUe2Cgp739VN3cImaokC+eQnhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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