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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd556e5017ada58ef18dd717e4af705a9ada5d755ae987c0d675f9df3abcbe382' 
  AND token = 'ttAM156OL4ue1FoCkcZ1/uM1jyKhblW/Akpu8IBmu5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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