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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2df60e97401260d5721f28e3b630f30d8d4bc85aaeec824f98c93affc16317f0' 
  AND token = 'BDL0g1cJsx90ZuGlpOh7rOJHDrgrne2UjCzo1vFLth0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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