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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea98c9fc0684b6dcb675a0bd5406f9ee775090463b9648df429c42d94be565e' 
  AND token = 'M4Ivrb3ECGudtNakj2odUq4sz6oQQowyNCQA9Pam0DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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