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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2746788fcbd946032215e7ea7cd64f3ffc7f14c94b744e83552f9702269df0d1' 
  AND token = 'nMXi9FlHrwdiFNYbA7uXSRn6w/Aq1EdzA2g9jG4I4OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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