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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95b8e2e5145e950fae276854a1b95d6cb09f5898a80a5846988666c467774ed7' 
  AND token = 'zlq3HEj8UNtoK9KXnTi1BHNL3cJAPSw0lamNUApGahA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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