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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f82bde35df477ed41c4269f2604bc0c04e28456dbe1d87bb02bedeb69dda5ce' 
  AND token = 'aENeZbI3WYosWpDBkUfZXAdfZc7zQBdvjXZK2bc+uHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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