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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e56bf697b72484d05dfe756b69619cf87d0208ec5148df1a4bcd19a9672d80b8' 
  AND token = 'P70X7smHC6zUXLw5zSG4C7Z6HAtR8/glHHsIApUteGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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