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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b636d899cba68bff261eee24094631f6aa2c8b19deb1a02f4c9a2ca7dcfc7a6' 
  AND token = 'j1LfznoB2dnUfAdP7HPgsvvQ4IQqSsXokDFxoUjS6gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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