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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3ff462a377b7d03e55e42e713e7e277a27e9cd2ba3527b3c5d6a6f00d10234' 
  AND token = 'UQ2uJg7zkr0PwNpn+0heZFbLeH5GeOBJO1LUTzSc0Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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