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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b6e78ba3dc87b7aad16780be1738d62bc3d0198ee27614f7220cdd2e3b73d97' 
  AND token = '6TrQOkmJ4qgifD31ICQhfWij3+/h8ssLrA/Dy4CVRAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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