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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '616cbf421f647736ce36a4065327b4463b2eb420525c05936aa12159b0614c8a' 
  AND token = 'JI6lzoi74FGlCox0Kp02kcQ0JaDc5vT3dWRk5PVf8/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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