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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fa98afc0a66bb17edd9c3422613c455100d989f6a1365e2e417f1255a51eea6' 
  AND token = 'Swh/jX6P9vue7TDP3r3sgVPi1NW3fy7hEBvhzBI0K0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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