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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96cb162912b38efd7c5f4b43010a9212d114ffbb9e0c7b5c5ee9990487b3002b' 
  AND token = 'fu4RndLa3GaHAJAM5jjQZ1ptYCrQCc+7idZ8Yd9O0bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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