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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fcede385ac07e7d3421388318ef34d73245b5e6996f3c30f4b4d16737406501' 
  AND token = 'Ui/n9RrnaUKg9Wwa/ydPqJPwiv0HQ0Fd4DRc3mAsWDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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