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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '640761fe0500f7ac0d3d47d19358c516d4a32ac9ba4cd8b2b244c2b69cc62db0' 
  AND token = 'QrB9OTmTygNcBpEj6iHJkdx9JaIB2BWABFhYb0buEhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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