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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d3540b9a10c945bf819e56dc8dfedff83f22d5f09953b636c4503c24118030' 
  AND token = 'FxK42WSs/ZSKXIwXYF9IxqW+X4hRXDGfhvV++oATs50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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