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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e4147e751c157473617110d2ebd7f74255229bd81de97acc56fec5338556e34' 
  AND token = 'WiaC2cjLVSy9k0w/YfIVzj8za6bI4zgXShzvRW0zFPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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