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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6be94dda8f329ca54b73eded7d357cc596b6f8542598f4299cac97b7f87eee' 
  AND token = 'uqWcPBBFARUNfdEwrKkM6ghefDoMLvgHOXw8hANKRtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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