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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17dfb986e710107375e76f51d1266d70f1db1cb0a982db5e0d80aebab180a76b' 
  AND token = 'sWPHMNQNJJXhrrq5xSXhTnuxhXp3Ze/3J+Z5EvrC8ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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