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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e336db4e03ef847617e14e330327dfa94aac4b219f1b99f55fd3ea55fd1821' 
  AND token = '5gOO3EQ3x6r7358BeWLb8KYXu5CJbNyfTrAREtyxaD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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