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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '242d57cc24232f0d158615616d76bf089b6da9eccb862d6e04c9e34b721f5e1e' 
  AND token = 'cADpGbuT3Mncawub2GE1/cOpIY/stHtltJ66XvA4hlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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