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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8654c6b71310152278cee27fab1a8a0cbc8a8eb772e3e6cdc3c0a744ce3bba1' 
  AND token = 'r86dWj9eEeh/znLrttFVGlRXwM0W/r4snpP3pDZe/JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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