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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87077a4d44100eeb171284a15c5d51d57a92ded584ad26b846960435fd984c7c' 
  AND token = 'DXs10VF5D15WdSDhzy3Bp5OQn8JdyRTF0hsaaf4EPfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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