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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fe865bc43a118790a6a3cd4b9b5fa1f4439961cf3ed8f8abeb1aac873c7ab11' 
  AND token = 'm1U3qtC/umUV2QMNgatWTty4Fgs2zJhIXnP0jtbllL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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