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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '651f2b71ce895e8633f6d611f8dd994c64f9901c5aa9bef0b637b2d67e8ee8d5' 
  AND token = 'RAj6/7LYtpR7g74dbT2mYeyGZKVlZdb9ggJzFu0FPbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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