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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '413b46dd9c49caefd368dbf9901fd2f8f3b659485ea8e9ae7ff0875f9fe9ad93' 
  AND token = 'xs6Mof24HDRtBWzNr1tnHO6BOXBgYq96Sb0aNlw1A1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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