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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77b9c363a0d980ff1c5783c07dda9e4a48a5dad5e6eda4a05c5cb94da1339d5d' 
  AND token = 'aG/78BcE2zubCcA9G7EdSfHxpc1f2pvAL7VObhZcwxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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