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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da7a8736bf48fc1b887323b7656a329628b2cf54a595573ff089cce81cb8523c' 
  AND token = '8RLDrdxg0KD5Dbuk5L22dIs9nO6jHIDR8j9a2JF1UwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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