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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1fee1bc52b1627a64a83c5baecea24b54650aa96240a9f2adcd6e277dfd667f' 
  AND token = 'KHrQyYo10fVStSUYX/STCGc/8CjY4mWDZDfiP+f4P3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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