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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3ddd0464e32800a2ff54cf5f9406490fbc71b125206075c8b9e80de0f3b7a4e' 
  AND token = 'Gx8jrSIYo8tgvLmV6OUtFg7rOLLLA4Hphx7VyEEzhGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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